There could be any number of computers behind an IP address, and most routers don't log which of their client computers made which request when. There are unreliable ways of identifying a machine that has previously visited a site - the most popular is storing a cookie with a random hash in the user's browser.
(April 2012) (Learn how and when to remove this template message) DMAIC (an acronym for Define, Measure, Analyze, Improve and Control) (pronounced dÉ-MAY-ick) refers to a data-driven improvement cycle used for improving, optimizing and stabilizing business processes and designs. The DMAIC improvement cycle is the core tool used to drive Six Sigma projects. However, DMAIC is not exclusive to Six Sigma and can be used as the framework for other improvement applications.
Define, Measure, Analyze, Improve, Control. Originally developed as part of the Six Sigma framework, DMAIC is a proven approach for eliminating defects and improving quality-related business metrics. DMAIC and Lean (the combined methodologies are known as Lean Six Sigma) complement each other and are the foundation for continuous improvement in most companies.